[Libre-soc-isa] [Bug 1051] OPF RFC ls012 research: create table of instructions and their priorities

bugzilla-daemon at libre-soc.org bugzilla-daemon at libre-soc.org
Tue Apr 11 10:22:58 BST 2023


--- Comment #9 from Jacob Lifshay <programmerjake at gmail.com> ---
(In reply to Luke Kenneth Casson Leighton from comment #8)
> (In reply to Jacob Lifshay from comment #7)
> > turns out the fpow instruction isn't super high priority for 3D, the
> > following is sufficient:
> > pow(b, x) = exp2(x * log2(b))
> ... and bit-level accuracy isn't absolute (or is it? what's the
> Khronos Group ULP for fpow?)

the spec literally says: the accuracy is "Inherited from exp2(y × log2(x))"

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